Well i got my little rad detector thingy in today. Read the booklet, got normal background reading, then checked my most recent catch from the ocean, a lobster tail i vacu-sealed and tossed in the freezer.
normal background readings (taken in my guest bathroom while reading the instructions....) was 0.11 μSv. I then checked the lobster tail, and it went up to 0.13μSv and stayed there. my kitchen had 0.12μSv.
Still reading the booklet to figure more stuff out, going to take it to the ocean first chance i get and see what it says.